/* css/style.css */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #f8f9fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
}

.wrapper {
    display: flex;
    width: 100%;
}

/* Sidebar */
.sidebar {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transition: all 0.3s;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.8);
    padding: 0.8rem 1.5rem;
    transition: all 0.3s;
}

.sidebar .nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: white;
    padding-left: 2rem;
}

.sidebar .nav-link.active {
    background: rgba(255,255,255,0.2);
    color: white;
    border-left: 4px solid white;
}

.sidebar .nav-link i {
    width: 25px;
}

/* Cards */
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card-header {
    background: white;
    border-bottom: 1px solid #eee;
    font-weight: 600;
    padding: 1rem 1.5rem;
}

.card-header:first-child {
    border-radius: 10px 10px 0 0;
}

/* Buttons */
.btn {
    border-radius: 5px;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* Tables */
.table {
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

.table thead th {
    background: var(--primary-color);
    color: white;
    font-weight: 500;
    border: none;
}

/* Forms */
.form-control, .form-select {
    border-radius: 5px;
    border: 1px solid #ddd;
    padding: 0.75rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Product cards */
.product-card {
    margin-bottom: 20px;
}

.product-card .card-img-top {
    height: 200px;
    object-fit: cover;
    border-radius: 10px 10px 0 0;
}

.price-tag {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Bid list */
.bid-item {
    padding: 10px;
    border-bottom: 1px solid #eee;
    transition: background 0.3s;
}

.bid-item:hover {
    background: var(--light-bg);
}

/* Alert */
.alert {
    border: none;
    border-radius: 10px;
    padding: 1rem 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
        position: fixed;
        top: 0;
        left: -100%;
        z-index: 1000;
        width: 250px;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    main {
        margin-left: 0;
        width: 100%;
    }
}

/* Loading spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}